Scott A. Bowling, Joseph D. Clarke, Yidong Liu, Daniel F. Klessig, Xinnian Dong, The cpr5 Mutant of Arabidopsis Expresses Both NPR1-Dependent and NPR1-Independent Resistance, The Plant Cell, Vol. 9, No. 9 (Sep., 1997), pp. 1573-1584
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Bowling et al. (1997) studied this question.